Desmos Graphing Calculator

CalcReferenceCopy

Math·Advanced Math·Nonlinear equations in one variable and systems of equations in two variables

medium

$$\begin{gathered} y=(x-7)(x+6) \\ y=4x-28 \end{gathered}$$
A solution to the given system of equations is $(x,y)=(a,b)$. Which of the following could be the value of $a$?

A

7

B

6

C

-6

D

-7